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X-ray opacity is a crucial factor of all radiation-hydrodynamics calculations, yet it is one of the least validated of the material properties in the simulation codes. Recent opacity experiments at the Sandia Z-machine have shown up to factors of two discrepancies between theory and experiment, casting doubt on the validity of the opacity models. Therefore, a new experimental opacity platform is being...
The high contrast front-end for the 200 TW Trident laser has shown in recent experiments the importance roles that Amplified Spontaneous Emission (ASE) and prepulse contrast play in laser-ion acceleration. Ion energies above 58 MeV with efficiencies of greater than 5% into ions above 4 MeV have been observed. Scalings for, laser energy, intensity, and target thickness are presented and compared to...
Summary form only given. Results from experiments performed at the recently commissioned LANL 200 TW Trident short-pulse laser at ~5??1019 W/cm2 (80-100 J and ~600 fs) are presented. We have conducted laser-ion acceleration experiments comparing flat foils and new Cu micro-cone targets in three separate geometries (flat-top, funnel, and snub-nose) to elucidate the production of hot electrons and ions...
In laser produced plasmas, the exponential electron density profiles makes modeling electron heat conduction difficult due to the variation in the electron mean free path. As a result, most radiation hydrodynamic simulations implement a flux limited diffusion model which applies a fractional multiplier to the Spitzer conductivity. While comparisons with experimental observations have provided guidance...
Summary form given only. A new short-pulse version of the single-hot-spot configuration has been implemented to enhance the performance of experiments to understand stimulated Raman scattering. The laser pulse length was reduced from ~200 to ~4 ps. The reduced pulse length improves the experiment by minimizing effects such as plasma hydrodynamics and filamentation of the interaction beam. In addition,...
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